Introduction to Circles: Terminologies and Concepts

The video tutorial introduces the concept of circles, highlighting their common presence in everyday objects. It explains basic terminologies such as radius, diameter, chords, and secants, and their mathematical definitions. The tutorial further explores segments, circumference, arcs, and sectors, using a park as a practical example. The session concludes with a recap and a clarification on the difference between circles and spheres.

Which of the following is a common example of a circular shape?

• Square

• Triangle

• Bangle

• Rectangle

What is the term for a line that passes through the center of a circle and connects two points on its boundary?

• Radius

• Chord

• Diameter

• Secant

What is the longest chord in a circle called?

• Tangent

• Radius

• Diameter

• Secant

What do you call the distance around the boundary of a circle?

• Radius

• Diameter

• Circumference

• Arc

What is a line called that touches a circle at exactly one point?

• Chord

• Secant

• Tangent

• Diameter

Which part of a circle is defined as the area bounded by two radii and an arc?

• Sector

• Diameter

• Segment

• Chord

What is the difference between a sector and a segment in a circle?

• A sector is a point, while a segment is a line.

• A sector is bounded by two radii, while a segment is bounded by a chord.

• A sector is a line, while a segment is an area.

• A sector is bounded by a chord, while a segment is bounded by two radii.